New Holland T8010 Manual page 1337

D - Instrumentation Cluster (ICU) Excitation Control Test
Test point
1 Place transmission in
PARK.
Start engine and set at
1000 rpm.
Backprobing at
Instrumentation Cluster
(ICU2) connector CN2
terminal 1 and measure
voltage.
Turn on various loads
(lights, heaters, etc.)
Section 55 - Electrical System - Chapter 1
Good Reading
Voltage varies between
12.8 and 14.5 volts in
response to load applied.
If good reading, excitation
control circuit is operating
properly.
55-1-156
Possible Cause of Bad Reading
Instrument Cluster (ICU2).